To be honest all I can here is a fan, sounds like a pc being on
I laid an old bed sheet on the dinner table and a wooden chopping board and welded my turbo manifold indoors at night, had the window open
Few craters in the table but denied all and suggest it was the kids lol
I think there pukka, the only recommendation I have is a proper auto darkening mask as you will get so frustrated with the stock thing
Oh and order e309l rods, I don't use anything else, there absolutely awesome to use and much much easyier than mild steel rods
Plus they weld mild to stainless 
Go for it mate, it was bought for me as a present but best damn present I ever got
I honestly don't know what I'd do without it, this whole project is possible to me and only me making things
Get one mate you won't regret it
Oh one last thing it comes with a 240v outside plug (the ones the plug into transformers
I rang the shop on eBay and he said you can just re wire a normal plug on it
